combining tests

[Sam Steingold]

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What is the correct idiom for combining tests to get one cached variable?

what I do now appears to work but results in ugly output:

...
checking whether libffcall is installed... checking how to link with
libavcall... -lavcall
checking how to link with libcallback... -lcallback
checking avcall.h usability... no
checking avcall.h presence... no
checking for avcall.h... no
checking callback.h usability... no
checking callback.h presence... no
checking for callback.h... no
no
...

the code is here:

AC_DEFUN([CL_FFCALL],[dnl
AC_ARG_WITH([ffcall],
[AC_HELP_STRING([--with-ffcall],[use FFCALL (default is YES, if present)])],
[cl_use_ffcall=$withval],[cl_use_ffcall=default])
AC_CACHE_CHECK([whether libffcall is installed],[cl_cv_have_ffcall],
[cl_cv_have_ffcall=no
if test $cl_use_ffcall != no; then
AC_LIB_FROMPACKAGE(avcall,libffcall)
AC_LIB_FROMPACKAGE(callback,libffcall)
AC_LIB_LINKFLAGS([avcall])
AC_LIB_LINKFLAGS([callback])
AC_CHECK_HEADERS(avcall.h callback.h)
if test $ac_cv_header_avcall_h = yes \
~     -o $ac_cv_header_callback_h = yes
then
cl_save_LIBS="$LIBS"
AC_LIB_APPENDTOVAR([LIBS], [$LIBAVCALL])
AC_LIB_APPENDTOVAR([LIBS], [$LIBCALLBACK])
AC_SEARCH_LIBS(__builtin_avcall)
AC_SEARCH_LIBS(trampoline_r_data0)
if test "$ac_cv_search___builtin_avcall" != no \
~     -a "$ac_cv_search_trampoline_r_data0" != no
then cl_cv_have_ffcall=yes
else LIBS=$cl_save_LIBS
fi
fi
if test $cl_use_ffcall = yes -a $cl_cv_have_ffcall = no; then
~  FFCALL=ffcall-1.8
~  AC_MSG_ERROR([despite --with-ffcall, FFCALL was not found
~ Either call configure without --with-ffcall or do
~  mkdir tools; cd tools; prefix=`pwd`/${ac_cv_host}
~  wget http://ftp.gnu.org/pub/gnu/ffcall/${FFCALL}.tar.gz
~  tar xfz ${FFCALL}.tar.gz
~  cd ${FFCALL}
~  ./configure --prefix=\${prefix} && make && make check && make install
~  cd ../..
~  ./configure --with-libffcall-prefix=\${prefix} [$]*])
fi
fi;])])
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